ARM Compiler toolchain Compiler Reference: Standard C language extensions

Standard C language extensions

The compiler supports numerous extensions to the ISO C99 standard, for example, function prototypes that override old-style nonprototype definitions.

These extensions are available if:

None of these extensions is available if:

the source language is C90 and the compiler is restricted to compiling strict C90 using the --strict compiler option.
the source language is C99 and the compiler is restricted to compiling strict Standard C using the --strict compiler option.
the source language is C++.

See:

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